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Can't signup MS 365 Dev Program because used too many phone numbers

tobai 0 Reputation points
2026-06-04T23:58:35.2+00:00

I wan't to signup https://developer.microsoft.com/en-us/microsoft-365/dev-program.

However, when I finally comitted to put my very own phone number in, I get the following message:

We can't continue with the signup process for the following reason:

  • You have used too many phone numbers.

For help with your Microsoft account, go to Microsoft account and verify your information.

MS-CorrelationId: [Moderator note: personal info removed]

Code: 40902

There is no option to add my phone number on my Microsoft account. How to overcome that blocker?

I've opened an Azure account. But couldn't find a workaround either.

Microsoft 365 and Office | Development | Microsoft 365 Developer Program
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  1. Hani-Ng 11,315 Reputation points Microsoft External Staff Moderator
    2026-06-05T00:43:20.8333333+00:00

    Please note that our forum is a public platform, and we will modify your question to hide your personal information in the description. Kindly ensure that you hide any personal or organizational information the next time you post an error or other details to protect personal data. 

    Hi tobai

    This error typically indicates that the automated security system has flagged the phone number or the verification attempt frequency as part of its fraud‑prevention measures. Once triggered, this limit cannot be overridden manually from the forum.

    You may try the following steps:

    • Wait at least 24–48 hours before retrying and avoid repeated attempts during this period.
    • If you previously had an E5 developer sandbox, note that there may be a cool‑down period before re‑provisioning with the same details.
    • Sign out of all Microsoft accounts and retry using InPrivate/Incognito mode.
    • Use a different browser and network and avoid VPNs or corporate proxies.
    • Ensure the phone number is a real mobile number (not VoIP or virtual) and has not been used previously for a Microsoft 365 Developer Program tenant. If possible, try using a different mobile number.

    As a forum moderator, I do not have the specialized tools or access rights to check your account status or resolve backend provisioning issues related to the Developer Program. This is something that must be handled by the program's dedicated team. If you believe you satisfy the criteria and are still experiencing difficulties, we recommend contacting Microsoft Developer Support for further assistance. Their support team is best positioned to provide direct help and resolve such issues effectively.

    Please note that this is a paid support ticket, which means it requires an active support plan or a one-time support purchase. However, the benefit of using this channel is that the team includes engineers and developers who work on the product itself, so they are best positioned to provide accurate, in-depth, and authoritative answers especially for complex or edge-case scenarios that go beyond publicly available documentation or community knowledge.

    Also be aware that Microsoft has updated eligibility requirements for new E5 developer subscriptions, and approval for a new sandbox is determined by the program’s current validation checks. Please refer to Microsoft 365 Developer Program FAQ | Microsoft Learn.

    I hope this information helps and if you have any question, please feel free to ask via comment section!

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  2. AI answer

    2026-06-04T23:58:45.89+00:00

    The Microsoft 365 Developer Program allows only one Developer Program account per phone number. If the phone number has already been used for a previous Developer Program signup, the platform will block reuse of that number.

    To proceed, the only supported option is to remove the existing Developer Program account that is associated with that phone number, then sign up again:

    1. Sign in to the existing Microsoft 365 Developer Program account that is currently tied to the phone number.
    2. Go to the Developer Program dashboard: https://developer.microsoft.com/microsoft-365/profile
    3. Choose Delete Profile to delete the current Developer Program account.
    4. After the profile is deleted, sign up again for the Developer Program using the desired account and the same phone number.

    Note:

    • Only one Microsoft 365 Developer Program account can be associated with a given phone number at a time.
    • A new subscription can only be obtained after the previous subscription has been active for more than 60 days.
    • Phone numbers and *.onmicrosoft.com email addresses cannot be used to sign in to the Developer Program; a supported work, Visual Studio, or Microsoft account email must be used.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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